Take the same cylinder heads, induction, exhaust cam etc from a low rpm, long stroke engine . And change the short block for a large bore, short stroke unit of IDENTICAL displacement. HP and torque will be identical along with slower piston speed. Why does a short stroke large bore engine get used in a high rpm application? The small bore engine does not have room for large valves and large dia ports to feed a engine making high HP. The small bore engine's small ports they choke off high rpm flow. The small bore engine since it can't breath at high rpms . It's equipped with a short duration cam which builds low end torque and further chokes off high rpm power. Compression is kept a little lower to limit compression pressure and detonation. The large bore, short stroke engine with the larger ports and valves which can provide flow a higher rpms. The engine is cammed with an longer duration cam and higher compression . Which makes higher mid range torque and top end power.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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